• Search of words "powder*" AND "diffract*" OR "powder*" AND "index*" OR "Rietveld" OR "powder*" AND "x-ray" OR "Debye" AND "Scherrer" OR "Guinier" AND "Hagg" OR "powder*" AND "refine*" or "powder*" AND "data" OR "powder*" AND "neutron", occuring in the paper title. This ensures that the authors considered that powder diffraction was the main topic of their paper.
• Note that ISI does not index all journals.
• Many software cited but unpublished or not published in ISI indexed journals are excluded (FULLPROF, etc), other are included, thanks to informations from the authors.
• Papers anterior to 1975 are excluded (with two exceptions for 2 papers from H.M. Rietveld and one paper from J.W. Visser).
• Detected fevers are bonded to research on superconductors, fullerenes, ab initio structure determination by powder diffractometry (SDPD)... Other highly cited papers are papers on new methods/programs, or applications to subject interesting a large audience (new fever is about nanocrystalline compounds).
• See the discussion at the Rietveld Mailing List archives.
• If your paper(s) escaped, send the reference to : alb@cristal.org.
• That list is more indicative than exhaustive, and it will be false one week later.....
• Another less restrictive list is available, including papers not having the above keywords in the title, but having them in the abstract. Note that few abstracts are available in the ISI database before 1991. Note also that this was made by using the trial Web of Science, with the following limits : no more than 500 papers can be processed together, and no more than 300 papers can be sorted together according to the times cited (as far as I know).
• See also 3 other lists of most cited papers about indexing, structure factor extraction, and special methods for SDPD.

Unfortunately : realizing a topic study is allowed only for personal use :

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